Spiders are wonderful creatures. Their varied and complex range of behavior and highly developed sensory systems are excellently adapted to the environmental conditions - as is proven by their evolutionary success. Over 400 million years, spiders have developed their sensory organs to a fascinating technical perfection and complexity. In his intriguing book, Professor Friedrich G. Barth puts this technical perfection into the context of biology , in which the interaction between environment and sensory organs and the selectivity of the senses as a link between environment and behavior play a major role.